Azo dyes of the diamino pyrimidine series

ABSTRACT

Azo dyes of the diaminopyrimidine series which may be exemplified by the formula   OR   IN WHICH Y is an electron-attracting substituent such as nitro, cyano, methylsulfonyl or the like and B is hydrogen or a substituent such as an alkyl, benzyl or phenyl group. The phenyl diazo component may also contain additional substituents and other readily available diazo components may replace the phenyl diazo component. The amino groups may also be substituted by replacement of one or both hydrogen atoms. These dyes are useful as disperse dyes for synthetic fibers, particularly polyesters. The dyes give yellow to blue violet shades having excellent fastness properties.

United States Patent [191 Dunkelmann et al.

AZO DYES OF THE DIAMINO PYRIMIDINE SERIES Inventors: Guenter Dunkelmann; Johannes Dehnert, both of Ludwigshafen, both of Germany Badische Anilin- & Soda-Fabrik Aktiengesellschaft, Ludwigshafen/ Rhine, Germany Filed: Jan. 19, 1973 Appl. No.: 325,216

Assignee:

References Cited UNITED STATES PATENTS 9/1970 Ackermann et al. 260/154 9/1970 Ackermann et a1. 260/154 9/1970 Ackermann et al. 260/154 10/1970 Ackermann et a1. 260/154 Dec. 24, 1974 Primary Examiner-Lorraine A. Weinberger Assistant Examiner-C. F. Warren Attorney, Agent, or Firm-Johnston, Keil, Thompson & Shurtleff [5 7] ABSTRACT Azo dyes of the diaminopyrimidine series which may be exemplified by the formula Y HzN are useful as disperse dyes for synthetic fibers, particularly polyesters. The dyes give yellow to blue violet shades having excellent fastness properties.

10 Claims, N0 Drawings AZO DYES OF THE DIAMINO PYRIMIDINE SERIES quilnone or heterocyclic amine; A is a radical of the formu a:

Z is hydrogen or an unsubstituted or substituted aliphatic, cycloaliphatic, araliphatic, aromatic or heterocyclic radical;

Z is hydrogen or an unsubstituted or substituted aliphatic, cycloaliphatic, araliphatic or aromatic radical;

Z is hydrogen or an unsubstituted or substituted aliphatic radical or Z and Z together with the nitrogen are a heterocyclic radical, and in which, independently of each other,

Z has the same meanings as Z,

Z has the same meanings as Z,

Z and Z together withthe nitrogen have the same meanings as Z and Z together with the nitrogen have, and one of the radicals Z to Z is other than hydrogen The invention relates particularly to dyes of the formula (la):

D is the radical of a diazo component (bearing an electron-attracting substituent) of the benzene series or a diazo component of the naphthalene, diphenyl, benzothiazole, benzoisothiazole, thiazole, thiadiazole, thiophene, triazole, benzotriazole, indazole, pyrazole, azobenzene or anthraquinone series;

A is a radical of the formula B is hydrogen, alkyl, alkenyl, alkyl bearing cyano, hydroxy, alkoxy, alkanoyloxy or phenoxy as a substituent, aralkyl, cycloalkyl, phenyl or phenyl bearing alkyl, halogen, alkoxy, nitro, cyano, alkoxycarbonyl, carbamoyl or sulfamido as a substituent;

R is hydrogen, alkyl of one to eight carbon atoms, cyanoalkyl of two to seven carbon atoms, hydroxyalkyl of two to nine carbon atoms, alkoxyalkyl of a total of three to 13 carbon atoms, cycloalkoxyalkyl, aralkoxyalkyl of up to 15 carbon atoms, phenoxyalkyl of a total of up to 12 carbon atoms, carbalkoxyalkyl of a total of three to 15 atoms, acyloxyalkyl of a total of up to 17 (IIb) aminonaphthalene,

carbon atoms, phenyl, phenyl bearing hydroxy, chlo rine, methyl, ethyl, ,B-hydroxyethyl, methoxy, ethoxy, B-hydroxyethoxy, cyano or dialkylamino as a substituent, cycloalkyl, bicycloalkyl, polycycloalkyl, unsubstituted or substituted aralkyl, or

w-N-pyrrolidonylalkyl of two to six carbon atoms in the alkyl;

R is hydrogen, alkyl of one to eight carbon atoms, aralkyl, hydroxyalkyl of two to seven carbon atoms, or acyloxyalkyl of a total of up to 15 carbon atoms, and

R and R together with the nitrogen may be the radical of pyrrolidine, piperidine, morpholine, piperazine, N-methylpiperazine or N-B-hydroxyethylpiperazine and thealkyl chains of the substituted alkyl radicals R and R may be interrupted by oxygen atoms and, inde pendently of one another,

R has the same meanings as R,

R has the same meanings as R, and

R and R together have the same meanings as R and R together, but one of the radicals R, R, R and R is other than hydrogen.

The following are examples of substituents for the radical D of the diazo components:

in the benzene series:

chlorine, bromine, nitro, cyano, trifluoromethyl, acetyl, propionyl, benzoyl, nitrobenzoyl, methylsulfonyl, ethylsulfonyl, phenylsulfonyl, p-(B-hydroxyethyhphenylsulfonyl, carbomethoxy, carboethoxy, carbobutoxy, carbo-B-methoxyethoxy, carbo-B- ethylhexoxy, carbo-B-hydroxyethoxy, unsubstituted, N-monosubstituted or N-disubstituted carbamoyl or sulfamido, methyl, ethyl, methoxy and ethoxy.

Examples of N-substituents of the carbamoyl or sulfonamido radicals are methyl, ethyl, propyl, butyl,

5 B-ethylhexyl, cyclohexyl, benzyl, phenylethyl, B-hydroxyethyl, B-hydroxypropyl, B-methoxyethyl, 7methoxypropyl and y-ethoxypropyl and also pyrrolidide, piperidide and morpholide.

Electron-attracting substituents of which at least one is present in the diazo component of the benzene series include, for the purposes of this invention, nitro, cyano, alkanoyl, aroyl, a'lkylsulfonyl, phenylsulfonyl, carbalkoxy and unsubstituted or substituted carbamoyl or sulfamoyl and also sulfonic ester groups. Examples of substituents in addition to those already mentioned are: acetyl, propionyl, benzoyl, chlorobenzoyl, nitrobenzoyl, methylsulfonyl, ethylsulfonyl, carbomethoxy, -ethoxy, -B-methoxyethoxy, -butoxy, and -B-ethylhexoxy, N-methylcarbamoyl, N-ethyl-, N-butyl-, N-B- ethylhexyl-, N,N-dimethyl-, N,N-diethyl-, N,N-d ibutyl-, N-methyl- N-,B-hydroxyethyl-, N-B-hydroxyethyl or N,N-di-B-hydroxyethylcarbamoyl, the corresponding sulfamoyl derivatives and the methyl-, ethylor pheny1- sulfonic acid esters.

In the azobenzene series:

chlorine, bromine, nitro, cyano, carbomethoxy, carboethoxy, methyl, ethyl, methoxy, ethoxy, hydroxy, acetylamino, formyl, ,B-hydroxyethoxy and ethoxycarbonylamino.

In the anthraquinone series:

halogen, particularly chlorine and bromine.

In the heterocyclic series:

chlorine, bromine, nitro, cyano, methyl, ethyl, phenyl, methoxy, ethoxy, methylmercapto, B-carbomethoxyethylmercapto, B-carboethoxyethylmercapto, carbomethoxy, carboethoxy, acetyl, methylsulfonyl and ethylsulfonyl.

Examples of radicals B, other than hydrogen, are:

alkyl of one to seven carbon atoms, cyanoethyl, methoxyethyl, ethoxyethyl, phenoxyethyl, benzyl, phenylwhere n is 2, 3, 4 or 6.

6. carboxyalkyl and carbalkoxyalkyl radicals:

CH COOE, CH CH -COE, (CH2)5-COOE Or Where E may be for example hydrogen, methyl, ethyl, propyl, benzyl, B-hydroxyethyl, w-hydroxyhexyl, 6-hydroxybutyl, B-methoxyethyl, y-methoxypropyl, y-ethoxypropyl, B-phenoxyethyl or B-hydroxyethoxyethyl;

7. Acyloxyalkyl radicals:

CH -CH -Oacyl, (CH -O-acyl, CH -(fH-O-acyl, (CH

) O-acy1,

) -O-acy1, where acyl is for example CO-H, (JO-CH COC H CO-CH-(CH -CH CO-CH -Cl,

CO--CH2-CO-CH3, COCH=CH2, common- 3, COCH=CH-COOH, (JO-((312)2- COOH, CO-(CH2)2-COOC2H5, CO-OH2-O-, 004E), COCH2,

cooc a or (JO-NH Q.

Suitable radicals R and R may be the alkyl, hydroxyalkyl, acyloxyalkyl and aralkyl radicals specified for R and R The radical D may be derived for example from the following amines:

o-nitroaniline, m-nitroaniline, p-nitroaniline, 0 cyanoaniline, m-cyanoaniline, p-cyanoaniline, 2,4- dicyanoaniline, 2-chloro-4-nitroaniline, 2-bromo-4- nitroaniline, 2-cyano-4-nitroaniline, 2-methylsulfonyl- 4-nitroaniline, 2-methyl-4-nitroaniline, 2-methoxy-4- nitroaniline, 4-chloro-2-nitroaniline, 4-methyl-2- nitroaniline, 4-methoxy-2-nitroaniline, 2-chl0ro-5- aminobenzonitrile, 2-amino-5-chlorobenzonitrile, lamino 2-nitrobenzene-4-sulfonic-n-butylamide or -B-methoxyethylamide, 2,4-dinitroaniline, 2,4-dinitro- 6-chloroaniline, 2,4-dinitro-6-bromoaniline, 2,4-dinitro-6-cyanoaniline, l-amin0*2,4-dinitrobenzene-6- methylsulfone, 2,6-dichloro-4-nitroaniline, 2,6- dibromo-4-nitroaniline, 2-chloro-6-bromo-4- nitroaniline, 2,6-dicyano-4-nitroaniline, 2-cyano-4- nitro-6-chlor0aniline, 2-cyano-4-nitro-6-bromoaniline, l-aminobenzene-4-methylsulf0ne, l-amino-2,6- dibromobenzene-4-methylsulfone, l-amin0-2,6- dichlorobenzene-4-methylsulfone, 1-amino-2,6- dinitrobenzene-6-carboxylic methyl ester, l-amino- 2,6-dinitrobenzene-fi-carboxylic methyl ester, 1- amino-2,6-dinitrobenzene-6-carboxylic B-methoxyethyl ester, propyl 3,S-dichloroanthranilate, B-methoxyethyl, 3,5-dibromoanthranilate, 4- aminoacetophenone, 4-arninobenzophenone, 2- aminobenzophenone, 2-aminodiphenylsulfone, the methyl, ethyl, propyl, butyl, isobutyl, B-ethylhexyl, cyclohexyl, benzyl, phenyl, B-meth0xyethyl, [3ethoxyethyl, fi butoxyethyl, methyldiglycol, ethyldiglycol, methyltriglycol, ethyltriglycol, B-hydroxyethyl, B-acetoxyethyl, B-(B'-hydroxyethoxy)-ethyl, B-hydroxypropyl, y-hydroxypropyl, m-hydroxybutyl, and m-hydroxyhexyl esters of Z-aminobenzoic acid, 3-aminobenzoic lide and N-methyl-N-B-hydroxyethylamide of 2- aminobenzoic acid, 3-aminobenizoic acid and 4- aminobenzoic acid, the diamide or bis-ymethoxypropylamide of S-aminoisophthalic acid, the bis-diethylamide of aminoterephthalic acid, the imide, B-hydroxyethylimide, 'y-hydroxypropylimide, phenylimide and p-tolylimide of 3-aminophthalic acid and 4- aminophthalic acid, the fl-hydroxyethylimide of 3-amino-6-nitrophthalic acid, the dimethylamide, diethylamide, pyrrolidide, morpholide and N methylanilide of 2-aminobenzenesulfonic acid, 3-aminobenzenesulfonic acid and 4-amin0benzenesul fonic acid, the 2-aminophenyl, 3-aminophenyl and 4-aminophenyl esters of methylsulfonic acid, the 2- aminophenyl, 3-aminophenyl and 4'-aminophenyl esters of ethylsulfonic acid, the 2-aminophenyl, 3- aminophenyl and 4-aminophenyl esters of butylsulfonic acid, the 2-aminophenyl, 3-aminophenyl and 4-aminophenyl esters of benzenesulfonic acid, the ethylimide, butylimide, B-methoxyethylimide and y-methoxypropylimide of 4-aminonaphthalic acid, I- aminonaphthalene, 2-aminonaphthalene, l-amino-2- ethoxynaphthalene, 2aminodiphenyl, 4- aminodiphenyl, l-aminoanthraquiinone, l-amino-4- chloroanthraquinone, 3-aminodiphenylene oxide, 4- aminodiphenylene oxide, Z-aminobenzothiazole, 2-

amino-6-methylsulfonylbenzothiazole, 2-amin0-6- nitrobenzothiazole, 5,6dichloro-2- aminobenzothiazole, 6,7dichloro-2' aminobenzothiazole, benzoisothiazole, benzoisothiazole, benzoisothiazole,

4-amino-5-bromo-7-nitro-l ,2-

3-amino-5-nitro-2, l 3-amino-5-niitro-7-bromo-2, l 2-aminothiazole, 2-amino-5- nitrothiazole, 2-amino-4-methylthiazole-5-carboxylic acid and 4-aminobenzoic acid, the methyl, isobutyl,

acid ethyl ester, 2-amino-4-methyl-5-acetylthiazole, 2-

amino-3-cyano-4-methylthiophene-S-carboxylic acid esters, 2-phenyl-5-aminol ,3 ,4-thiadiazole, 3- methylmercapto-S-amino-l ,2,4thiadiazole, 3-6- carbomethoxyethylmercapto-S -amino- 1 ,2,4-

chloroindazole, 3-amino-5-nitroindazole, l-benzyl-S- aminopyrazole and 1-phenyl-5-aminopyrazole.

Examples of suitable diazo components of the aminoazo series are:

4-aminoazobenzene, 2,3-dimethyl-4- aminoazobenzene, 3,2-dirnethyl-4-aminoazobenzene, ,5-dimethyl-4-aminoazobenzene, 2-methyl-5- methoxy-4-aminoazobenzene, 2-methyl-4,5- dimethoxy-4-aminoazobenzene, 4'-chloro-2-methyl-5- methoxy-4 aminoazobenzene, 4-nitro-2-methyl-5- methoxy-4-aminoazobenzene, 4'-hydroxy-2 methyl-5- methoxy-4-aminoazobenzene, 4-(B-hydroxyethoxy)- 2-methyl-5-methoxy-4-aminoazobenzene, 4'-hydroxy- 2,2'-dimethyl-5-methoxy-4-aminoazobenzene, 4'- hydroxy-2,2'-dimethyl-5-methoxy-4- aminoazobenzene, 4-hydroxy-4-aminoazobenzene, 4'- hydroxy-Z'-methyl-4-aminoazobenzene, 4'-hydroxy-3 methyl-4-aminoazobenzene, 2-hydroxy-5'-methyl-4- zgl g zggzg zgz l 'f ggig f img-i radicals. Compounds of formula (Vb) give in the first m a Z reaction sta e a mixture of 2-chloro-4- amlnoazobenzene l aminopyrimidi e and 2-amino-4-chloropyrimidine deamlnoazobenzene 4 rivatives in which the remaining chlorine atom may be amlnoazobenzene replaced by the same or another amine. Either uniform amlnoazobenzene compounds or mixtures are thus obtained. amlnoazobenzene 4 1 For the synthesis of coupling components with the i zzfi i i gf g zgib g g g ggl i'aigz i radical of formula (llb) it is also possible for example amin azobenzene, 4'-chloro-2:5-dimethoxg-4- to react a compound of the formula (VII) aminoazobenzene, 4'-nitro-2,5-dimethoxy-4- aminoazobenzene, 4-(hydroxyethoxy)-2,5-dimethoxy- 4-aminoazobenzene, 4-chloro-2,5-dimethyl-4- 5 aminoazobenzene, 4'-methoxy-2,5-dimethyl-4- aminoazobenzene, 4-nitro-4-aminoazobenzene, 3,5- dibromo-4-aminoazobenzene, 2,3 -dichloro-4- HO (VII) aminoazobenzene, 3-methoxy-4-aminoazobenzene, 1- pheny1aZ0-4aminonaphthalenfi, and 'P y in which R is preferably methyl or ethyl, with a priethoxy-4-aminonaphthalene. mary or secondary amine of the general formula (VI) y 0f the formula y be p p y reacting 40 to form a Z-aminopyrimidine derivative of the formula a diazo compound of an amine of the general formula (VIII); (III):

B B DNH 2 {:NQ 4

m N\ or N)- N 3 19 1 'D' xii/hya coupling component of the general formula OH HO (VIII) H-A 5O Compounds of formula (VIII) are also accessible from (w) suitably substituted guanidines and B-keto esters. The where A and D have the meanings given above. hydroxy] group in i intermediate (VIII) may be Diazotization of the amine may be carried out by a placed conventional reagents such as phosphorus conventional method Coupling may also be carried out oxychlc-mde Phosphorusmchlonde phosphorus conventionally in an aqueous medium, with or without i gphgsbgene z the addition of a solvent, under weakly to strongly acid 2 2$; i gi en 6 rep ace y a prim ry or conditions I When compounds of formula (V) are reacted with a For the production of the Coupling Components of mixture of different amines with complete replacement formula (IV) a pp p p formula (Va) or (Vb) of the chlorine atoms, mixtures of coupling components are obtained. The mixtures of dyes which can be 01 B prepared therefrom may, with suitable choice of the F N amines and their relative proportions in the mixtures, I N\ Cl have a substantially better affinity for synthetic fibers than a single dye of the mixture. C1 01 When ammonia or a volatile amine such as methyl- (Va) (Vb) 8 may be reacted with an amine of the general formula 2 Hit-R Primary or secondary amines may be used. By suitable choice of the reaction conditions it is also possible to 0 replace the chlorine atoms of the compound of the formula (V) in stages so that monosubstitution products or disubstitution products may be isolated. The reaction conditions which affect the exchange of the chlorine atoms are the temperature, the amine component, 15 the molar ratio of the reactants and the diluent or solvent.

The compounds of formula (Va) are converted in the first stage of the reaction into 4-chloro-6- aminopyrimidine derivatives which can be reacted,

20 with or without intermediate isolation, to form 4,6-

diaminopyrimidines with the same or different amine amine or ethylamine is used as the amine component for the preparation of the coupling component ofthe formula (IV) it is advisable to use solutionsof these amines or of ammonia in a solvent which is inert under the reaction conditions. Suitable solvents, depending on the reaction temperatures, are water, methanol, ethanol, ethylene glycol, ethylene glycol monomethyl or dimethyl ether, dimethylformamide or N methylpyrrolidone, It is possible however to use the liquified amine under superatmospheric pressure without any solvent.

An excess of the amine or acid-bindng agents conventionally used such as tertiary amines, magnesium oxide, alcoholates or alkalies may be used to bind the hydrogen chloride liberated in the reaction.

Examples of amines of formula (VI) are:

ammonia, allylamine, methylamine,ethylamine, npropylamine, isopropylamine, n-butylamine, isobutylamine, tern-butylamine, isoamylamine, n-hexylamine, isohexylamine, n-octylamine, isooctylamine, B-ethylbutylamine, B-ethylhexylamine, cyclohexylamine, B-hydroxyethylamine, B-hydroxypropylamine, 'y-hydroxypropylamine, w-hydroxyhexylamine, [3-methoxyethylamine, ,B-ethoxyethylamine, B-butoxyethylamine, y-(B'-ethylhexoxy)-propylamine, B-(B'-hydroxyethoxy)-ethylamine, 'y-(B'-phenoxyethoxy)-propylamine, y-(B-hydroxybutoxy)-propylamine, -y-ethoxypropylamine, y-methoxypropylamine, 'y-isopropoxypropylamine, B-amino-B-ethyLB, y-propanediol, B-methyl-B- aminopropanol, N-methyl-N-B-hydroxyethylamine, N- ethyl-N-B-hydroxyethylamine, diethanolamine, dimethylamine,- diethylamine, dipropylamine, morpholine, piperidine, pyrrolidine, thiomorpholine-S-dioxide, B-aminoethylthiomorpholine-S-dioxide, N-y-aminopropylpyrrolidone, aniline, o-toluidine, m-toluidine, p-toluidine, o-methoxyaniline, m-methoxyaniline, pmethoxyaniline, o-chloroaniline, m-chloroaniline, pchloroaniline, o-cyanoaniline, m-cyanoaniline, pcyanoaniline, o-ethoxyaniline, m-ethoxyaniline, pethoxyaniline, o-ethylaniline, m-ethylaniline, pethylaniline, the methylamide or B-methoxyethylamide of p-aminobenzoic acid, 4-(B-hydroxyethyU-aniline, 4-(B-hydroxyethoxy)-aniline, N-/3-hydroxyethylaniline,

Y fly. 1

N-methylaniline, benzylamine, B-phenylethylamine or I3-phenyl-B-hydroxyethylamine, and also aminoacetic acid, B-aminopropionic acid, w-aminocaproic acid and esters of the same. The amines belonging to the radicals specified in the case of R and R are also suitable.

When the dyes ofthe formula (I) according to the invention contain one'or more than one ester group in the radicals R, R R or R the production of the compounds of formula (l)may in principle be carried out according to the said methods if the corresponding ester group(s) is(are) contained in the'coupling component. In some cases it is advantageous however to introduce the acid radical acyl intothe finished dye ofthe formula (I). The free acids, their anhydrides, chlorides sponding acids may in special cases be used as solvent.

Thus the reaction with acetic anhydride may be carried out in glacial acetic acid. When using acid chlorides as the esterifying agent it is advantageous to add acidbinding agents to the reaction mixture, for example sodium carbonate, sodium acetate, magnesium oxide or pyridine.

The following are specific examples of esterifying agents:

formic acid, acetic acid, propionic acid, a-ethylhexan oic acid, chloroacetic acid, phenylacetic acid, phenoxyacetic acid, acrylic acid, benzoic acid, and the esters, anhydrides or chlorides of these acids, and also ethyl chloroformate, diketene, methyl isocyanate and phenyl isocyanate.

What has been said about the production of dyes containing acyloxyalkyl radicals also applies to compounds of formula (I) which contain one or more than one carbalkoxyalkyl group in the radicals R, R R or R. Esterification of the finished] dye is carried out by methods known from the literature, for example with acid catalysis in excess alcohol and distillation of the water of reaction. Examples of suitable acid catalysts are p-toluenesulfonic acid and acid ion exchangers. Examples of alcohols are methanol, ethanol, propanol, benzyl alcohol, ethylene glycol, ethylene glycol methyl or phenyl ether, diglycol, triglycol, 1,4-butanediol and 1,6-hexanediol.

Particular industrial value attaches to dyes and dye mixtures .of the general formulae (lb) and (lo):-

HN Y 1 5 Y 3 (Ib) (Ic) in which B is hydrogen, methyl, ethyl, propyl, butyl, a-ethylpentyl, benzyl, phenyl or phenyl bearing methyl, ethyl, methoxy, ethoxy, chloro or nitro as a substituent;

Y is nitro, cyano, chloro, bromo, carbomethoxy, carboethoxy, methylsulfonyl, ethylsulfonyl, methyl, methoxy, phenylazo, p-nitrophenylazo, phydroxyphenylazo, p-methoxyphenylazo, pchlorophenylazo or methylphenylazo;

Y is hydrogen, nitro, chloro, bromo, cyano, methyl, methoxy, carbomethoxy, carboethoxy, methylsulfonyl or ethylsulfonyl;

Y is hydrogen, chloro, bromo, cyano, methyl, methoxy, carbomethoxy or carhoethoxy; and

11 R, R and R have the meanings given above.

Particularly preferred radicals B are hydrogen, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, benzyl or phenyl.

Examples of preferred radicals R to R are:

CH CH OH, CH CH CH OH, CH QHOH, C IH-CH OH, (CH O(CH OH,

CH CH CH OH CH CH CH CH OH CH CH OCHO, CH CH CH OCHO, CH CH OCOCH CH CH OCOCH OC H CH CH CH OCOCH OC H CH CH OCH CH OCHO, CH CH OCH CH OCOCH OC H CH CH OCOCH C H or CH CH OCH CH OCOCH C H CH CH OCH CH CH OC H CH CH OC H (CH OCI-I (CH OC H (CH OC H OC H Moreover dyes are preferred which contain a radical of the formula these being derived from radicals of pyrrolidine, piperidine or morpholine. The coupling components for the dyes of formula (I) are preferably chosen so that at least one oxygen atom is contained in one of the radicals R to R The corresponding dyes which contain as diazo components benzothiazole, benzoisothiazole, thiazole, thiadiazole or thiophene, each of which may bear, as substituent, nitro, chloro, bromo, cyano, methyl, methylmercapto, B-carbomethoxyethylmercapto, B-carboethoxyethylmercapto, carbomethoxy, carboethoxy or acetyl are particularly valuable.

The following are given as examples from among particularly valuable diazo components:

aminobenzonitrile,

aminoazobenzene, 4 -nitro-2-methyl-5-methoxy-4- aminoazobenzene and 4-nitro-2,5-dimethoxy-4- aminoazobenzene.

The following are examples of particularly valuable heterocyclic diazo components:

2-aminothiazole, 2-amino-5-nitrothiazole, Z-amino- 4-methyl-5-nitrothiazole, 2-amino-4-methylthiazole-5- carboxylic ethyl ester, 2-amino-4-methyl-5- acetylthiazole, 2-amino-5-phenyl-l,3,4-thiadiazole, 3- phenyl-S-amino-l,2,4-thiadiazole, 3-methylmercapto- 5-amino-1,2,4-thiadiazole, 3-,8- carbomethoxycthylmercapto-S-amino-1,2,4- thiadiazole, 3-B-carboethoxyethylmercapto-5-amino- 1,2,4-thiadiazole, 2-amino-6-nitrobenzothiazole, 2- amino-3-cyano-4-methylthiophene-S-carboxylic esters, 3-amino-5-nitro-2,l-benzoisothiazole, 3-amino-5- nitro-7-chloro-2,l-benzoisothiazole, 3-amino-5-nitro- 7-bromo-2,1-benzoisothiazole, 4-amino-7-nitro-l,2- benzoisothiazole, 4-amino-5-bromo-1,2- benzoisothiazole, 4-amino-5 -hromo-7-nitro-1,2- benzoisothiazole and 4-amino-5-cyano-7-nitro-l,2- benzoisothiazole.

The new dyes are yellow to blue and are suitable for dyeing textile materials of acrylonitrile polymers, synthetic polyamides, cellulose esters such as secondary acetate or triacetate, and particularly synthetic linear polyesters such as polyethylene glycol terephthalate or polymers having an analogous chemical constitution. Deep colorations are obtained which have good fastness properties.

The following Examples illustrate the invention. Parts and percentages are by weight unless stated otherwise.

EXAMPLE 1 75 parts of 2-phenyl-4,6-dichloropyrimidine is introduced into 75 parts of B-hydroxypropylamine which has been heated to 80C. The reaction mixture is then heated to 150C and kept at this temperature for 14 hours. The mixture is worked up by stirring it into 1,000 parts of ice-water so that the 4,6-bi s-(B- hydroxypropylamino)-2-phenylpyrimidine separates as a highly viscous oil which crystallizes throughout after a few hours. The melting point of the product is 144C.

EXAMPLE 2 A mixture of 100 parts by volume of ethanol, 20 parts of triethylamine and 16.5 parts of B-methoxyethylamine is heated to 70C and then 52 parts of 2-(pchlorophenyl)-4,6-dichloropyrimidine is introduced. For the production of 2-(p-chlorophenyl)-4-(B- methoxyethylamino)-6-chloropyrimidine the reaction mixture is boiled under reflux for 6 hours and then stirred into 1,000 parts of water. The crude product is at first oily and crystallizes throughout in the course of a few hours. It has a melting point of 65C.

53 parts of the compound thus obtained and having the formula:

is heated with 42 parts of yB-(B'-hydroxyethoxy)- ethylamine for 12 hours at 170C. 1,000parts of water is then added to the reaction mixture and the oily product which separates and which has the probable formula:

1 NH- C H OCH is isolated from the supernatant aqueous phase. The pyrimidine derivative may be used immediately for coupling after it has been dissolved in methanol.

EXAMPLE 3 128 parts of 2-phenyl-4-(y-hydroxypropylamino)-6- chloropyrimidine (prepared analogously to the first paragraph of Example 2) and 160 parts of 'y-ethoxypropylamine are heated for 8 hours in an autoclave at 170C. The reaction mixture is introduced into 2,000 parts of water and the oily diaminopyrimidine formed having the formula:

EXAMPLE 4 112.5 parts of 2-phenyl-4,o-dichloropyrimidine is introduced at 0C into 650 parts of concentrated sulfuric acid. Then within 2 hours 30 minutes at 0C a mixture of 65 parts of 98% nitric acid and parts of concentrated sulfuric acid is dripped in, the whole is stirred for another hour at 0C and the mixture is then poured carefully into ice. The 2-m-nitrophenyl- 4,6dichloropyrimidine obtained has a melting point of 133 to 135 C after it has been recrystallized from dioxane.

In order to exchange the chlorine atoms, 135 g of the product thus obtained is heated with 56 parts of y-hydroxypropylamine for 4 hours at C. The diaminopyrimidine of the formula: 1

The pyrimidine derivative of the formula:

is precipitated, by pouring the reaction mixture into NH- C H OH ice-water, as an oil which slowly crystallizes.

NM 485 parts of the product thus obtained is heated with 75 parts of y-hydroxypropylamine for 1 1 hours at 4 120C. After conventional working up the compound of the formula NH- 11 -00 N CH is used for coupling after the reaction mixture has been g poured into water and the aqueous phase decanted. 10 NH-C H OH EXAMPLE 5 For the production ofa coupling component mixture is obtained as a crystalline substance having a melting 67.5 parts of 2-phenyl-4,6-dichloropyrimidine is intropoint of 58 to 60C. duced at 60C into a mixture of 37.5 parts of y-hydroxypropylamine and 44.5 parts of y-methoxypropyl- EXAMPLE 8 amine. The mixture is then heated for 13 hours under 45.2 parts of 2-diethylamino-4-hydroxy-6- reflux and poured into water as usual. The oil obtained methylpyrimidine (prepared from N,N- is a mixture of three coupling components having the diethylguanidine and ethyl acetoacetate) is boiled probable formulae: under reflux with 50 parts of phosphorus oxychloride N 5 6' N 3 6 N' 3 6 3 cw N' N= l -C H -OCH -C5H6-OH NH OCH3 EXAMPLE 6 and 1 part of pyridine for 1 hour. The reaction mixture is then fractionated at subatmospheric pressure. The 2-ethylamino-4-chloro-6-methylpyrimidine passes over at 87 to 88C at 0.5 mm. It is worked up analogously to the second paragraph ofExample 7.

63 parts of 2-methyl-4,6-dihydroxypyrimidine and 230 parts of phosphorus oxychloride are boiled under reflux for 90 minutes. The reaction mixture is then poured onto ice and after the aqueous phase has been buffered with sodium acetate the deposited Z-methyl- EXAMPLE 9 4,6-dichloropyrimidine is filtered off. While the residue is still moist it is introduced into 180 parts of y-methoxypropylamine and the whole is heated to refluxing temperature until quantitative reaction has taken place. After cooling, 200 parts by volume of dioxane is added to the reaction mixture, the deposited 'y-methoxypropylamine hydrochloride is suction filtered and the filtrate is evaporated at subatmospheric pressure.

63 parts of 4-methyluracil isboiled under reflux with 230 parts of phosphorus oxychloride for 45 minutes.

After conventional working up the 4-methyl-2,6-

40 dichloropyrimidine while it is still moist is introduced while cooling into 180 parts of y-methoxypropylamine.

The reaction mixture is heated for 3 hours at 115C,

and then excess amine is distilled off. To remove the 'y-methoxypropylamine hydrochloride the residue is stirred with dioxane, the precipitated salt is suction filtered and the filtrate is distilled after evaporation of the solvent. The diaminopyrimidine of the formula:

NH- C H O- CH H 50 N 3 NH-C H -O-CH 3 5 H CO-H C HN H-C H -OCH remains as a viscous oil which slowly crystallizes.

EXAMPLE 7 passes over at 199C at 0.25 mm Hg. 100 parts of 2-piperidino-4-hydroxy-6- I EXAMPLE 10 methylpyrimidine is introduced into 250 parts of phos- I phows oxychloride and the mixture is the boiled To diazotize 6-chloro-2,4-dlnitroanllme, 11 parts of under reflux for one hour. The pyrimidine derivative of the amine is introduced at i a mixture of 9 the formula. parts of concentrated sulfuric acid and 16 parts of mtrosylsulfuric acid and stirred for another 3 hours at 0 to 5C. When diazotization is finished the sulfuric acid solution is added in portions to a mixture of 15 parts of 5 the pyridimidine derivative (obtained according to Exk ample 1 dissolved in 50 parts by volume of formamide, 30 parts by volume of 10% hydrochloric acid and 400 -k Cl parts of ice. After the excess sulfuric acid has been buffered-with sodium acetate solution to a pH of from 1 to. 2 the coupling is ended within a short time. The deposited dye of the formula:

HN CH CH- CH EXAMPLE ll 8 parts of 2-amino-5 -nitrobenzonitrile is diazotized at C in 46 parts of concentrated sulfuric acid and 16 parts of nitrosylsulfuric acid. After 6 hours the diazonium salt solution is poured into ice-water, any undissolved product is filtered off and the filtrate is allowed to flow into a solution of 16.5 parts of 2-phenyl-4-(B- hydroxyethylamino)-6-(y-isopropoxypropylamino)- pyrimidine in 100 parts by volume of formamide, 25 parts by volume of 10% hydrochloric acid and 500 parts of ice. The coupling mixture is brought to pH for 2 to 3 with sodium acetate and after the end of the reaction the deposited dye is isolated by filtration. The compound, whose composition corresponds to the formula:

dyes polyethylene glycol terephthalate fibers scarlet shades having outstanding fastness to light and dry-heat pleating and setting.

EXAMPLE 12 4.2 parts .of o-aminobenzonitrile is dissolved in 100 parts by volume of water and 10 parts by volume of concentrated hydrochloric acid, then 100 parts of ice is added anddiazotization is carried out conventionally with sodium nitrite. The diazonium salt solution obtained is clarified and added at 0 to 5C to a solution of 13 parts of the pyrimidine derivative obtained accordingto Example 2 in 100 parts by volume of formamide and 500 parts of ice water. The pH of the mixture is then raised to from 4 to 5. After coupling is over the deposited yellow precipitate is isolated, washed, dried and ground. The dye whosecomposition corresponds to the formula:

0 H OCH 1s dyes polyester cloth yellow shades having very good fastness properties.

EXAMPLE 13 12 parts of 2-amino-3-bromo-5-nitrobenzonitrile is diazotized by the process described in Example 10. The mixture obtained is then dripped into a mixture of 14 parts of 2-methyl-4,6-bis-('y-mcthoxypropylamino)- pyrimidine (Example 6), 20 parts by volume of concentrated hydrochloric acid, 150 parts by volume of formamide'and 500 parts of ice-water and the pH of the solution is kept at about 4.

The precipitated dye of the formula:

dyes polyethylene glycol terephthalate materials fast red shades.

EXAMPLE l4 6.9 parts of p-aminoazobenzene is intimately ground with [5 parts by volume of concentrated hydrochloric acid and left for l2 hours at room temperature. The paste is then suspended in 350 parts of water, the appropriate amount of sodium nitrite is added and the whole is stirred for 4 hours at room temperature. The filtered diazonium salt solution is then added to a mixture of 11.5 parts of the coupling, component mixture obtained according to Example5 (dissolved in parts by volume of formamide with an addition of 20 parts by volume of concentrated! hydrochloric acid) and 500 parts of ice. After the coupling mixture has been buffered to pH 5 the whole is stirred for a few hours and the dye is then isolated in conventional manner. The product is shown by thin-layer chromatography to consist of three substances of the probable formulae:

C EN 3 H OCH and gives deep orange shades having good fastness properties on polyester fibers. The following dyes or dye mixtures are obtained analogously to the methods described in the foregoing Examples.

Ex No NH-CH -|-CH-CH NH-CH -CH-CH 2 1 5 2 1 OH OH NH-C H O-CH NH-C H OCI-I 36 Shade of dyeing on polyester red red orange scarlet red scarlet red orange 

1. A DYE OF THE FORMULA
 2. A dye as claimed in claim 1 of the formula
 3. A dye as claimed in claim 1 wherein: D has the same meanings as in claim 1; B1 is hydrogen, alkyl of 1 to 4 carbon atoms, benzyl or phenyl; R1 is hydrogen, alkyl of 1 to 4 carbon atoms, cyclohexyl, phenylalkyl of 1 to 3 carbon atoms in said alkyl, phenyl, methylphenyl, methoxyphenyl, hydroxy of 2 to 6 carbon atoms, alkoxyalkyl of 1 to 4 atoms in said alkoxy and 2 or 3 carbon atoms in said alkyl, benzyloxypropyl, Beta -phenylethoxypropyl, phenoxypropyl, -CH2CHOHC6H5, -(CH2)2O(CH2)2OH, -(CH2)3O(CH2)2OH, -(CH2)3O(CH2)4OH, -(CH2)3OC2H4OCH3, -(CH2)3OC2H4OC4H9 or -(CH2)3OC2H4OC6H5; R2 is hydrogen or alkyl of 1 to 4 carbon atoms; R3 is the same as R1; and R1 and R2 together with the nitrogen may also be pyrrolidino, piperidino or morpholino; with the proviso that one of R1, R2 and R3 is different from hydrogen.
 4. The dye of the formula
 5. The dye of the formula
 6. The dye of the formula
 7. The dye of the formula
 8. The dye of the formula
 9. The dye of the formula
 10. The dye of the formula 